Sudoku #h163

Sudoku game, level: Hard #163. This Sudoku have 25 given numbers (clues)..
Structure: 2 (1 pcs.), 9 (1 pcs.), 1 (2 pcs.), 7 (3 pcs.), 6 (3 pcs.), 4 (3 pcs.), 8 (4 pcs.), 5 (4 pcs.), 3 (4 pcs.), ∑25.


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4
7
2
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3
8
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8
1
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7
5
3
8
4
1
8
6
5
9
7
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